Ophthalmoscope.



No. 887,032. PATENTED MAY 5, 1908. H. L. DE ZENG.

OPHTHALMOSGOPB.

APYLIOATION FILED JAN. 6, 1908.

uvanfoz UNITED STATES PATENT, oFFIoE.

HENRY L. ZENG, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE DE ZENG-STAND:

.ARD COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

. OPHTHALMOSCOPE.

Application filed January To all whom it may concern:

Be it known that I, HENRY L. DE 'ZENG, a citizen ,of the United States, residing in the city' and county of Philadelphia, State of Pennsylvania, have invented a new and useful Ophthalmoscope, of which the following is a specification.

My invention relates to a new and useful reflector for ophthalmoscopes, retinoscopes, head mirrors, etc., having means for preventing the rays'from the light source from reaching the eye of the operator or user.

It further'consists of other novel features of construction, all as will be hereinafter fuly set forth.

igure 1 represents a front elevation of a portion of an ophthalmoscope embodying my invention. Fig. 2 represents a sectional view on an enlarged scale. Fig. 3 represents a reflector provided with a guard. Fi 4 represents a erspective view of a guard wiiich maiy be emp oyed. v

have found in practice .in the use of ophthalmosco es, retinoscopes, head mirrors, etc., for iagnostic work, that when the light strikes a perforated reflector it also strikes the edge of the opening through which the operator is looking. This causes a reflection of the light to enter the eyeof the operator and prevents him from seeing-clearly. .My invention is designed to overcome this defect and in the drawings, I have shown a construction for carrying out my invention but it will be evident that the arrangement of. the parts may be varied and other instrumentalities may. be employed which will come within the-scope of my invention and I do not therefore desire to be limited in ever instance to the exact construction as herein shown and described but desire to make such changes as may be necessary.

In the construction shown in Figs. 1 and2,

I have shown my invention as applied-to the luminous ophthalmoscope, in which 1 desig- 'nates a portion of the handle of the ophthalmoscope in which the electric-lam is preferably incased or seated, said light eing preferably beneath a lens which concentrates the light and directs it u on a reflector or mirror 2 from which it is re ected into the patients eye, as will be evident, said mirror being suita ly supported by the plate or body 3 and being provided with the opening 4 which is Specification of Letters Patent.

Patented May 5, 1908.

s, 1908. swam. 409,406.

in alinement with a suitable opening in the plate 3 and through which the operator makes the examination. ,I find in practice that in devices of this kind the light striking the edge of, the opening 4, in the reflector 2, will cloud the vision of the operator. In order to overcome this defect, I provide a guard or protector 5, which in Fig. 2 is shown as a tube or shield which projects a suitable distance and prevents the rays of light from the lamp from reaching the wall 6 of the opening 4. The operator can thus have a clear vision through the o ening 7 in the plate 3 and through the tu an possibility of the .rays of light strlking the edge 6 ofthe opening 4 and bein reflected into his eye. In place of the tu e, I

form, as for example in the form shown in Fig. 4, which is a curved late or part of a In Fig. 3, I have shown an ordinary head mirror 9 which can also be provided with the guard or protector 8, as described.

The guards or protectors can be supported in the openings in any desired and necessary manner and it will be understood that any size or shape may be emplo ed which may be necessary and may be app ied to any device which reflects light and permits examinations therethrough. As will of course be understood,*the ophthalmoscopes are provided with a series of lenses 10 which are suitably mounted or supported, in the present instance, in the disk 11, so that they can be broughtv successively into alinement or registered with the opening 4 in the reflector 2 and the opening 7 in the plate'3 through which the operator looks.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A reflecting device having a perforation and a guard or shield for said perforation.

2. A reflecting device having a perforation and a guard'or shield suitably supported by said device for preventing the ra s of light from striking the wall of said pe oration.

source of light. a reflector having a perforation therethrough, and means for preventing the rays from said light source from directly entering said'perfo'ration.

e 5 or over the shield without I may make the guard or protector in any tube 8 adapted to be seate in the opening 4.

3. In a deviceof the character described, a I

4. Ina device of the character described, a I the rays from said light'source striking the source of light, a reflector having a sight Wall of said opening. opening therein, and means located therein 6. A reflector having means for viewing for preventing the rays from said light source the object therethrough and means for pre- 5 from striking the Wall of said opening. venting the rays from a light source from di- 15 5. In a device of the character described; a rectly striking said first mentioned means. source of light, a reflector having an opening HENRY L. DE ZENG. therein, a series of lenses suitably supported Witnesses: and ada ted to be brought into allnement C. D. MCVAY, 10 with said opening, and means for preventing \r F. A. N EWTON. 

